Hi there,
Fryer's Digital Controller will display "BOIL" if the temperature is it reading does not exceed 212F or 100C for quite some time. Make sure that there is enough level of oil (not water) in the Fry Pot before turning it on.

Hi there.
The soot or carbon have probably build up inside the fire tubes, better check and have an authorized service technician clean them.
Make sure that the fryer is receiving the rated gas pressure and correct gas type as stated on the nameplate, this way, carbon or soot formation on fire tubes can be prevented
Regards.

first be sure the valve is in the on position. sounds crazy but I've been there. Next even though the pilot is lit it may not be burning hot enough to make the Thermo pile produce the 750 millivolts the valve needs to operate. If the thermo pile is producing the proper current then the gas valve itself is the culprit. If you are not comfortable with gas and do have the proper testers You should call a pro. The pilot is easy to clean though. turn the gas valve to the off position and remove the pilot. When you remove the gas line to the pilot there is a small oriface inside that looks like a little thimble. Remove it and clean it. the gas flows through a very small hole that clogs very easy. Reassmble it tighten the gas line. Check for leaks with some bubbles and give it a try.

Sounds crazy but check for power at the outlet. If that's good then possibly a bad cord,Power switch or interlock safety switch if it has one. Do you hear a humming sound when you try to use it? If so the motor is frozen up. Hope this helps.